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What is a switching power supply module DC chopper?
2023-12-21
DC/DC conversion is to convert a fixed DC voltage into a variable DC voltage, also known as DC chopping. Chopper works in two ways, one is the pulse width modulation mode Ts unchanged, change ton (general), the second is the frequency modulation mode, ton unchanged, change Ts (easy to produce interference). Its specific circuit consists of the following categories: (1) Buck circuit-step-down chopper, its output average voltage Uo is less than the input voltage Ui, the polarity is the same. (2) Boost circuit-boost chopper, its output average voltage Uo is greater than the input voltage Ui, the polarity is the same. (3) Buck-Boost circuit-buck or boost chopper, its output average voltage Uo is greater than or less than the input voltage Ui, polarity is opposite, inductive transmission. (4) Cuk circuit-buck or boost chopper, its output average voltage Uo is greater than or less than the input voltage UI, polarity is opposite, capacitive transmission. Today's soft switching technology has made a qualitative leap in DC/DC. A variety of ECI soft switching DC/DC converters designed and manufactured by VICOR Company in the United States have maximum output powers of 300W, 600W, 800W, etc. The corresponding power density is (6, 2, 10, 17)W/cm3, and the efficiency is (80-90)%. The latest RM series of high-frequency switching power supply modules using soft switching technology introduced by NemicLambda Corporation of Japan has a switching frequency of (200~300)kHz and a power density of 27W/cm3. Synchronous rectifiers (MOS-FET instead of Schottky diodes) are used to increase the efficiency of the entire circuit to 90%.
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